Samsung UE46C7705 t-con or panel failure?

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  • PowerAmpFreak
    Badcaps Veteran
    • Feb 2010
    • 977
    • Sweden

    #1

    Samsung UE46C7705 t-con or panel failure?

    Hi all
    I need you guys to help me diagnose this one.
    It should be a t-con or panel failure.
    I swapped the mainboard with another set, and the result are the same.
    I hardly think the PSU could do this, output voltages are stable.
    According to owner the set was OK in the evening and the morning after bad.
    He says the panel was not hit and there are no signs of it.
    The pattern flashes up and down repeatedly, see attachment.
    One last thing: If pulling out LVDS cable between t-con and mainboard, the pattern is gone (that's why I tried another mainboard).
    Thanks for any advice.
    Attached Files
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Samsung UE46C7705 t-con or panel failure?

    Looks like panel to me.
    Did you try running with only one of the ribbons installed in the T-con? Any change in picture?
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • Shinju
      Badcaps Legend
      • Mar 2014
      • 1239
      • USA

      #3
      Re: Samsung UE46C7705 t-con or panel failure?

      Can you see the ODS? Enter the service menu and run the test patterns if applicable.

      Comment

      • PowerAmpFreak
        Badcaps Veteran
        • Feb 2010
        • 977
        • Sweden

        #4
        Re: Samsung UE46C7705 t-con or panel failure?

        No OSD possible. Audio is OK.
        I have not tested with only one ribbon between panel and t-con yet.

        Comment

        • Kilroys
          Senior Member
          • Feb 2014
          • 70
          • Sweden

          #5
          Re: Samsung UE46C7705 t-con or panel failure?

          Something like this ?
          Attached Files

          Comment

          • DemonBG
            Senior Member
            • Mar 2012
            • 143
            • USA

            #6
            Re: Samsung UE46C7705 t-con or panel failure?

            I had a set with similar symptons which turned out to be a bad T-con.

            In my instance, the TV booted up fine, all sound worked but nothing on the screen but a similar pattern to yours would constantly flash on and off an otherwise black screen...

            My TV was a UE40C6540 though - different Tcon.

            Comment

            • PowerAmpFreak
              Badcaps Veteran
              • Feb 2010
              • 977
              • Sweden

              #7
              Re: Samsung UE46C7705 t-con or panel failure?

              It turned out to be a bad t-con. Proved by swapping with another working set.
              But, I can't find any standard Samsung article number on the board like BNXX-XXXX, I don't know how to adress a new one.

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Samsung UE46C7705 t-con or panel failure?

                That's surprising, maybe low VGL(VOFFE) or VGH(VONE) on T-con?
                Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                Comment

                • Moreno83
                  Badcaps Legend
                  • Jun 2014
                  • 2008
                  • The Netherlands

                  #9
                  Re: Samsung UE46C7705 t-con or panel failure?

                  Is a T-con board repairable?
                  I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                  Comment

                  • DemonBG
                    Senior Member
                    • Mar 2012
                    • 143
                    • USA

                    #10
                    Re: Samsung UE46C7705 t-con or panel failure?

                    It really depends what is wrong with it... Personally, i dont bother repairing them. For me the risk of a bad "repair" which could cause damage to the panel is not worth the cost of replacing them...

                    Usually the T-con is the cheapest of the boards in a TV when you are trying to repair so again; not worth the risk IMHO.

                    Comment

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